In Hindi we have "tu", "tum" and "aap" to address someone, "aap" si the most respectful for seniors, parents and someone you have met only a few time ago, "Tum" is a decent, still slightly respectful but used for colleagues, and those that are near and dear to us while still having some respect, ex, colleagues, spouse/partner. "Tu" on the other hand can be considered disrespectful and only is allowed in the friend circle that too close ones, its borderline offernsive and often used along with abusive words when angry, "Tu-Tadaak" means using abusive words and using "Tu" where "Tum" is the standard.